It will make it worse. Given the very polished surface of glass, no matter what type of paint you use it will conform to the flat surface of glass and hence will look shiny from the other side. This will effectively enhance the mirror effect.
Try it on a small piece of glass or a small area of your fish tank and you'll see. You can easily scrape it off using a flat blade.
Try it on a small piece of glass or a small area of your fish tank and you'll see. You can easily scrape it off using a flat blade.
